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# How many grams of calcium are consumed when 156.8 mL of ISBN: 9780321910295 34

## Solution for problem 97P Chapter 11

Introductory Chemistry | 5th Edition

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Problem 97P

PROBLEM 97P

How many grams of calcium are consumed when 156.8 mL of oxygen gas, measured at STP, reacts with calcium according to this reaction?

2 Ca(s) + O2(g) → 2 CaO(s)

Step-by-Step Solution:
Step 1 of 3

Solution 97P

Given:

Volume of oxygen = 156.8 ml = 0.1568 L

2 Ca(s) + O2(g) → 2 CaO(s)

We will have to find out the mass of Ca consume in the given reaction.

At STP (standard temp and pressure, 0 deg C and 1 atm) 1 mole of any ideal gas occupies a volume of 22.4 L

So moles O2 = volume (L) / 22.4 L/mol

= 0.1568 L / 22.4 L mol-1

= 0.007 mol O2

The balanced equation shows that 1 mole O2 reacts with 2 moles Ca

So moles Ca = 2 moles...

Step 2 of 3

Step 3 of 3

##### ISBN: 9780321910295

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